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The General Electric GEnx (General Electric
Next-generation) is an advanced dual rotor,
axial flow, high-bypass turbofan jet engine in
production by GE Aviation for the Boeing 787 and
747-8. On July 28, 2012, the NTSB initiated an
investigation of an engine failure that occurred
on a Boeing 787 during a pre-delivery taxi test
in Charleston, South Carolina.
"The parties to our investigation the FAA, GE
and Boeing have taken many important steps and
additional efforts are in progress to ensure
that the fleet is inspected properly," said NTSB
Chairman Deborah A.P. Hersman. "We are issuing
this recommendation today because of the
potential for multiple engine failures on a
single aircraft and the urgent need for the FAA
to act immediately."
In addition, on August 31, 2012, a GEnx-1B
engine installed on a Boeing 787 that had not
yet flown was found to have an indication of a
similar crack on the fan midshaft. The fan
midshaft was removed from the engine for further
inspection and examination. As a result of the
investigative work to date, the NTSB has
determined that the fan midshafts on the GEnx
engines fractured or cracked at the forward end
of the shaft where the retaining nut is
installed.
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